Back when the 1968 Bizzarrini 5800GT was new and in the magazines, there were models of it and the Iso Grifo counterpart, and I think they were 1/32nd. That would be a great find, especially if you could find one in good enough shape to make a mold.
That might be how George Turner did it. There's one thing I can tell you, George Turner bodies are very, very fine, and they cost like it. They are absolutely worth every penny.